So that users can run all of their existing binaries. Both Mac processor architecture changes so far have included emulation or binary translation layers for t

So that users can run all of their existing binaries. Both Mac processor architecture changes so far have included emulation or binary translation layers for this purpose. 68k -> PPC: https://en.wikipedia.org/wiki/Mac_68k_emulator https://en.wikipedia.org/wiki/Mac_68k_emulator PPC -> x86: https://en.wikipedia.org/wiki/Rosetta_(software) https://en.wikipedia.org/wiki/Rosetta_(software)